Signor to george westing house



(No Model.)

W. STANLEY, Jr.

AUTOMATIC CUT-OUT FOR ELECTRIC LIGHT CIRCUITS.

N0.'349,613. Patented Sept. 21, 1886.

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(UNITED STATES XVI LTJIAM STANLEY, JR. OF GREAT PATENT Orrrcs.

BARRINGTON, .WIASSAOHUSETTS, AS-

HltlN'OR TO GEORGE XVESTINGHOUSE. JR, OF :PTT'JFSBTIRG, 19A.

Application tiled llcrember ltl, 188;).

f (LZZ 70710772 it puny concern:

lie it known that l'.\ViL1.iAu S'rANLi-n', Jr., a citizen of the United States, residing in Great Barrington. in the county of Berkshire and State ot' Massachusetts, have invented certain new and nsvt'ul improvements in Automatic (jut-Outs t'or ,l lleetrie-Light Circuits, ot' which the following is a specification.

My invention relates to the class of appara [0 ins employed for automatically interrupting the eonneet ions of an electric circuit when traversed by currents of abnormal strength.

The invention is espeeially designed to be employed in connection with an electric-light 1 system in which currents of a. given potential are eonverted into eurrents ot' a dit'terenti potential tlnrough the instrumentality of an induetion eoil or indnetorinm.

The objeet ol' the invention is to provide an electronnagnetit: device operated by a eurrent of abnormal strength in. thesecondaryortranslating eireuit ol'theinduetorinm to automatically interrupt the eonneetions of the primary circuit.

The invention eonsists in, normally completing the cireuit-eimneetions t'rom the source ot' eleetrieity in a converter or translating system with the primary eoil ot' the iin tuetorium or emlverter through an automatic eircuitinten 3O rupting deviee which .is capable of being operated. to sever such conneetions through the instrumentality ol'a releasing deviceineluded in. thesecondaryeirenitot'the.ilnluetorinm. This device is not in any manner alt'eeted by currents ol' the strength which are normally designed to t raversethe seeondanvor translating eireuit, but will be aeted upon by currents of abnormal or dangerous strength to operate the circuitri nt errnpting device.andthereby release a movable arm. .t'rom a. detent', the aetion ol' whieh is to i mmediately sever the connections of the primary circuit.

The accompanying drawing is a side eleva tion of an apparatus embodying the. essential 5 features of the invention, illustrating the eircuit-connections in. diagram.

.ltet'erring to the tigu re, L L represent a main line proceeding from anysuitable source. A, of electricity, and B represents an imluctorium or converter. The primary coil 7/ is included in circuit with the main line L L", its eonnec- CATION forming part of Letters Patent No, 349,613, dated September 21, 1886.

Serial No. 180,161. (No model.)

tious being as follows: from the section L of the main line, through a conductor, 1, to one terminal ot' the primary coil. 1) ot' the inducto riuin B, thence by a conductor, 2, to a pivoted lever, c, thence through a contact spring or brush, carried by the lever to a contact plate, 0'', against which the brush normally rests. The platecis connected. by a conductor,

3, with the sections II of the mainline con ductor. A spring, 0, tends to draw the brush 0* from the plate, and to thus interrupt the connections of the primary. It is prevented, however, from so operating by a strip, G, of fusible metal, which constitutes a portion of the secondary circuit 11 12 of the induetorium 0r converter, and through which the currents developed in the secondary coil If ordinarily pass. The currents of the strength normally employed for operating the translating devices 7th in the secondary circuit do not affect the t'usible strip; but a current of abnormal strength will develop sut'licicnt heat in traversing the strip 0 to fuse it. The lever thereupon responds to the tension of the spring 0, and with- 7f draws the spring 0' from its plate 0, thereby interrupting the connections of the main line through the primary circuit.

It is evident that there may bevarious me chanical modifications in the method of employing this safety-strip ot' fusible metal for accomplishing this same result, and that these may be adopted without departing from the spirit of my invention.

The application of the cutout has been described in connection with the, primary coil in such manner that it operates to sever the connections of the conductor leading thereto.

It is evident. however, that a shunt-circuit might be formed around the coil by the circuit-controller, if desirable. Thus a second contact-point may be applied to the contact arm or lever in such position that the lever rests against it when t'rced by the device in the secondary circuit, as indicated in dotted 5 lines.

In another application of even date herewith, Serial No. 186,163, I havc'described and claimed another device for similar purposes operated by electromagnetism produced by abnormal currents.

I claim as my invention- 1. The combination, substantially as hereinbefore set forth, with the primary circuit of an induction-coil, of a secondary circuit therefor, translating devices in the secondary circuit, a fusible strip, also included in the secondary circuit, and a circuit-interrupting device for the primary circuit normally restrained by said fusible strip, but released by the melting of said strip.

2. The combination, substantially as hereinbefore set forth, with the primary circuit of an induction-coil, of its secondary circuit,'translating devices in the secondary circuit, and a device responding to the heat developed by an abnormal current in the secondary circuit for interrupting the connections of the primary circuit. 

